I originally bought my two Canon 77D for doing weddings and similar group shoots where a long zoom on one and short on the other let me catch the action from wherever I happened to be standing. I don't do weddings or paid gigs any more, but with my Tamron 18-400 mm lens on one of the 77D, it has become the camera that I take with me out of the studio most often. One good zoom lens for everything. The second 77D is presently in a camera cage and set up as a back-up camera for video work.
My 90D, especially if I put the Tamron 18-400 lens on it, is just far too heavy to carry any distance, so it is now the camera that mostly gets used in my studio, usually mounted on a K&E geared head on one of my Regalite 6' camera stands. The studio is set up for portraits and video, but I'm now doing mostly "Product", "Still Life", and "Macro" type work, since in my old age I don't walk or move around well anymore. Minimizing trip hazards has become a very high priority in my life too.
My studio shooting room is 19 X 26' and was once the bedroom part of a 2nd Master Bedroom Suite on the 2nd floor of my home ( We use the one on the first floor ). It has a double bath and walk-in gear closet off the shooting room. The large hallway at the top of the stairs is the hair, makeup, and break area, and a long walk-in closet is also off the hallway. It presently holds my props as well as family storage. I converted this second floor area into my studio 6 years ago. It's small by commercial standards, but I carefully designed it for maximum use, making it as versatile and quickly convertible as possible for still and video work, and I can switch easily from one form of photography to another very quickly. With power on the ceiling, power cords on the floor are almost never required. If they are, they usually get connected at outlets along the walls of the studio, and with a small carpet sample placed over them for safety. Even my tether cable is off the floor. It goes up to the ceiling grid and over to my computer table where it drops down the wall to my computer. There is sufficient slack at the camera end to allow free movement of the camera over most of the camera half of the studio and it has an extension to use if it should be necessary.
The video and other lighting is all on a DIY ceiling mounted support grid and I can do portraits and other still work with stands, soft boxes, etc below them without the need to remove these video lights (8 LED panels, 4 UV LED panels, and 2 Tungsten 500 watt spots). The ceiling grid allows me to locate any light anywhere in about a 10 x 20' shooting area of the studio. Power for the hanging lights comes from power strips on the ceiling and I use wireless power control modules at each light and remotes located on each camera stand to select which lights on this ceiling grid receive power, without the need to climb a ladder to turn them on or off. Power for lights on stands for still shooting also comes from the power strips on the ceiling, so again, no power cables on the floor. Even the center ceiling LED light (work light) is remotely and wirelessly controlled from the original door switch position, each camera stand, my computer table, and a wheeled tool box that I keep near and left of me when doing a shoot. When it is absolutely necessary to turn off this "Work light" for a shoot I can, from anywhere that I might be, without the need to move around in the dark. I frequently place my camera on the toolbox when taking short breaks in the shoots to re-position lights, subject, etc. It holds my Gaffer Bag, and other supplies that might be needed quickly during a photo shoot.
My "most used" backdrops are on a 10' wide backdrop system that also has a wireless remote to control each of 6 backdrops. These remotes are also located at each camera stand.
Charley